1333 + Interview Questions in HYDROGEN IN GENERAL AWARENESS Page 8 InterviewSolution

351.	The colour of hydrogen isA. BlackB. YellowC. OrangeD. Colourless.
Answer» Correct Answer - D Colourless (Refer to Comprehensive Review).

Discussion

352.	Which of the following is an atom of tritium?A. B. C. D.
Answer» Correct Answer - B Tritium is `._(1)^(3)H` having one proton and two neutrons. It has no. of protons = 1, no. of electrons = 1, no. of neutrons = 2.

Discussion

353.	Which of the following statements is correct?A. Metallic hydrides are deficient of hydrogenB. Metallic hydrides conduct heat and electricityC. Ioniuc hyrdrieds do not conduct electricity in solid stateD. ionic hydrides are very good conductors of electricity is solid state.
Answer» Correct Answer - A::B::C The ionic hydrides are crystalline, non-volatile and non-conducting in solid state. However, their molten state conduct electriciy.

Discussion

354.	Which of the following statements is correct?A. Hydrides of group 13 act as Lewis acidsB. Hydrides of group 14 are electronC. Hydrides of group 14 act as lewis acidsD. Hydrides of group 15 act as Lewis bases
Answer» Correct Answer - A::D All elements of group 13 will form electrondefficient compounds which acts as lewis acids. All elements of group 14 will form electronprecise compounds. Electronrich hydrides have excess electrons which are present as long pairs. Elements of group 15-17 forms such compounds. `NH_(3)` has 1- lone pair, `H_(2)O-2 ` and `H_(2)O_(2)` and HF-3 lone pairs act as Lewis bases.

Discussion

355.	Metal which does not react with cold water but evolves `H_(2)` with steam is `:`A. NaB. MgC. AuD. Fe
Answer» Correct Answer - D Na reacts with cold water, Mg reacts with hot water, Fe reacts with steam and Au does not react with water. `3Fe+underset(("steam"))(4H_(2)O)to Fe_(3)O_(4)+4H_(2)uarr`

Discussion

356.	Which of the following is a true structure of `H_(2)O_(2)` ?A. B. C. D.
Answer» Correct Answer - B Open book structure (Non-polar).

Discussion

357.	`H_(2)O_(2)rarr 2H^(+)+O_(2)+2e^(-),E^(@)=-0.68V`. This equation represents which of the following behaviour of `H_(2)O_(2)`A. ReducingB. OxidisingC. AcidicD. Catalytic.
Answer» Correct Answer - A As `H_(2)O_(2)` is loosing electrons so it acting as reducing agent.

Discussion

358.	`H_(2)O_(2)` is always stored in black bottles becauseA. It is highly unstableB. Its enthalpy of decomposition is highC. It undergoes autooxidation on prolonged standing.D. None of these.
Answer» Correct Answer - C `H_(2)O_(2)` is unstable liquid and decomposes into water and oxygen either on standing or on heating.

Discussion

359.	`H_(2)O_(20` is always stored in black bottles becauseA. It is highly unstableB. Its enthalpy of decomposition is highC. It undergo autoxidation on prolonged standingD. None of these
Answer» Correct Answer - C `H_(2)O_(2)` is unstable liquid and decomposes into water and oxygen either on standing or on heating.

Discussion

360.	Assertion (A) `H_(2)O_(2)` is not stored in glass bottles. Reason (R ) Alkali oxides present in glass catalyse the decomposition of `H_(2)O_(2)`A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.C. If Assertion is True but the Reason is False.D. If both Assertion & Reason are False.
Answer» Correct Answer - A

Discussion

361.	Which of the following is wrong about `H_(2)O_(2)` ? It is usedA. As aerating agent in production of sponge rubberB. As an antichlorC. For restoring white colour of blackened lead paintingD. None of the above.
Answer» Correct Answer - D `H_(2)O_(2)` shows all these properties.

Discussion

362.	When a mixture of ammonium sulphate and `50% H_(2)SO_(4)` is electrolysed, the products formed at anode and cathode areA. `H_(2)` and `H_(2)O_(2)`B. `(NH_(4))_(2)S_(2)O_(8)` and `H_(2)`C. `H_(2)` and `NaHSO_(4)`D. `H_(2)O_(2)` and `H_(2)`.
Answer» Correct Answer - B `{:((NH_(4))SO_(4),+H_(2)SO_(4)to,2NH_(4)HSO_(4)),(2NH_(4)HSO_(4),overset("Elcetrolysis")(to),(NH_(4))_(2)S_(2)O_(8)+H_(2)),(,,"Ammonium cathode"),(,,"Per sulphate (anode)"):}`

Discussion

363.	When 50% solution of `H_(2)SO_(4)` is electrolysed by passing a current of high density at low temperature the main products of electrolysis are:A. oxygen and hydrogenB. `H_(2)` and peroxy disulphuric acidC. `H_(2)` and `SO_(2)`D. `O_(2)` and peroxy disulphuric acid
Answer» Correct Answer - B `2H_(2)SO_(4)hArr2H^(+)+2HSO_(4)^(-)` Cathode `2H^(+)rarr2e^(-)+H_(2)` Anode `2HSO_(4)^(-)rarrH_(2)S_(2)O_(8)` (peroxy disulphuric acid)+`2e^(-)`

Discussion

364.	Which of the following statements is incorrect ?A. `H_(2)O_(2)` can act as an oxidising agentB. `H_(2)O_(2)` can act as a reducing agentC. `H_(2)O_(2)` has acidic propertiesD. `H_(2)O_(2)` has basic properties.
Answer» Correct Answer - D Hydrogen peroxide does not show basic properties.

Discussion

365.	`H_(2)O_(2)` isA. poor polar solvent than waterB. better polar solvent than `H_(2)O`C. both have equal polarityD. better polar solvent but its strong auto oxidising ability limits its use as such.
Answer» Correct Answer - C Although `H_(2)O_(2)` is a better polar solvent than `H_(2)O`. However it cannot be used as such because of the strong autooxidation ability.

Discussion

366.	Name the phenomenon as a reason of which water has unusual boiling point.
Answer» Water has unusual boiling point due to presence of extensive inter-molecular hydrogen bonding.

Discussion

367.	Density of ice is ………than density of liquid water.
Answer» Density of ice is less than density of liquid water.

Discussion

368.	Mention the temperature at which density of ice is maximum.
Answer» At 4^oC, density of ice is maximum.

Discussion

369.	At atmospheric pressure, ice crystallized in the ………form but at very low temperature, it condenses to……. form.
Answer» At atmospheric pressure, ice crystallized in the hexagonal form but at very low temperature, it condenses to cubic form.

Discussion

370.	In which of the compounds does hydrogen have an oxidation state of -1 ?A. `CH_(4)`B. `NH_(3)`C. `HCl`D. `CaH_(2)`
Answer» Correct Answer - D

Discussion

371.	The low density of ice compared to water is due toA. Intense covalent bondingB. Dipole-induced dipole interactionC. Intense hydrogen bondingD. Dipole-dipole interactions
Answer» Correct Answer - C

Discussion

372.	`H_(2)O_(2)` isA. Poor polar solvent than waterB. Better polar solvent than `H_(2)O`C. Both have equal polarityD. Better polar solvent but its strong auto oxidising ability limits its use as such
Answer» Correct Answer - d Althoudh `H_(2)O_(2)` is a better polar solvent than `H_(2)O`. However, it cannot be used as such because of the strong autoxidation ability.

Discussion

373.	Hardness of water cannot be removed byA. Treating with washing sodaB. BoilingC. Adding calgonD. Addition of chlorine.
Answer» Correct Answer - D

Discussion

374.	`H_(2)O_(2)` is stored inA. Glass containersB. Metallic vesselsC. Plastic vesselsD. Conttainers exposed to sunlight.
Answer» Correct Answer - C

Discussion

375.	Temparary hardness may be removed from water adding.A. `CaCO_(3)`B. `Ca(OH)_(2)`C. `CaSO_(4)`D. `HCl`
Answer» Correct Answer - B

Discussion

376.	The name hydrogen was given by1. Cavendish2. Lavoisier3. Haber4. none of these
Answer» The name hydrogen was given by Lavoisier

Discussion

377.	FILL IN THE BLANKS1......................means ‘maker of water’ in Greek.2. In nature, hydrogen occurs as a..............molecule represented as H2.3. Sodium liberates hydrogen when treated with cold.............. 4. .................zinc is preferred over pure zinc in the laboratory preparation of hydrogen.5. The compounds of carbon and hydrogen are called................ 6. Hydrogen is present abundantly in the................ 7. In electrolysis of water, dilute sulphuric acid is added to increase..................... of water.8. Ammonia is used to make.............
Answer» 1. Hydrogen means ‘maker of water’ in Greek. 2. In nature, hydrogen occurs as a diatomic molecule represented as H₂. 3. Sodium liberates hydrogen when treated with cold water. 4. Granulated zinc is preferred over pure zinc in the laboratory preparation of hydrogen. 5. The compounds of carbon and hydrogen are called hydrocarbons. 6. Hydrogen is present abundantly in the atmosphere. 7. In electrolysis of water, dilute sulphuric acid is added to increase conductivity current of water. 8. Ammonia is used to make fertilizers.

377.

FILL IN THE BLANKS1......................means ‘maker of water’ in Greek.2. In nature, hydrogen occurs as a..............molecule represented as H2.3. Sodium liberates hydrogen when treated with cold.............. 4. .................zinc is preferred over pure zinc in the laboratory preparation of hydrogen.5. The compounds of carbon and hydrogen are called................ 6. Hydrogen is present abundantly in the................ 7. In electrolysis of water, dilute sulphuric acid is added to increase..................... of water.8. Ammonia is used to make.............

Answer»

1. Hydrogen means ‘maker of water’ in Greek.

2. In nature, hydrogen occurs as a diatomic molecule represented as H₂.

3. Sodium liberates hydrogen when treated with cold water.

4. Granulated zinc is preferred over pure zinc in the laboratory preparation of hydrogen.

5. The compounds of carbon and hydrogen are called hydrocarbons.

6. Hydrogen is present abundantly in the atmosphere.

7. In electrolysis of water, dilute sulphuric acid is added to increase conductivity current of water.

8. Ammonia is used to make fertilizers.

Discussion

378.	Hydrogen perxoide acts as oxidising agent?A. netural mediumB. alkaline mediumC. alkaline and neutral mediumD. acidic and alkaline medium.
Answer» (e ) `H_(2)O_(2)` can act s oxidising agent in both acidic and alkaline medium.

Discussion

379.	Which is the lightest of all elements?1. hydrogen2. helium3. lithium4. none of these
Answer» hydrogen is the lightest of all elements.

Discussion

380.	The process of adding oxygen to a substance is called1. oxidation.2. reduction.3. displacement.4. hydrogenation.
Answer» The process of adding oxygen to a substance is called oxidation.

Discussion

381.	Hydrogen burns in air with aA. light bluish flameB. yellow flameC. cimson red flameD. green flame.
Answer» Correct Answer - A Hydrogen burns in air with blue flame. `2H_(2)+O_(2)to 2H_(2)O`

Discussion

382.	The oxide that gives `H_(2)O_(2)` on treatment with a dilute acid isA. `PbO_(2)`B. `Na_(2)O_(2)`C. `MnO_(2)`D. `TiO_(2)`
Answer» Correct Answer - B `Na_(2)O_(2)+2HClrarr 2 NaCl+H_(2)O_(2)` `Na_(2)O_(2)+H_(2)SO_(4)rarrNa_(2)SO_(4)+H_(2)O_(2)`

Discussion

383.	The oxide that gives `H_(2)O_(2)` on treatment with a dilute acid isA. `MnO_(2)`B. `PbO_(2)`C. `Na_(2)O_(2)`D. `TiO_(2)`
Answer» Correct Answer - c `Na_(2)O_(2)+H_(2)SO_(4) rarr Na_(2)SO_(4)+H_(2)O_(2)`

Discussion

384.	Which of the following equations depict theoxidising nature of `H_(2)O_(2)` ?A. `2MnO_(4)^(-)+6H^(+)+5H_(2)O_(2)rarr 2Mn^(2+)+8H_(2)O+5O_(2)`B. `2Fe^(3+)+2H^(+)+H_(2)O_(2)rarr 2Fe^(2+)+2H_(2)O+O_(2)`C. `2I^(-)+2H^(+)+H_(2)O_(2)rarr I_(2)+2H_(2)O`D. `KIO_(4)+H_(2)O_(2)rarr KIO_(3)+H_(2)O+O_(2)`
Answer» Correct Answer - C Oxidising nature of `H_(2)O_(2)` means it oxidises other substance and itself gets reduced. In such reactions `O_(2)` is not evolved. In (a), `MnO_(4)^(-)` gets reduced from `Mn^(7+)` to `Mn^(2+)`. In (b), `Fe^(3+)` gets reduced to `Fe^(2+)`. In (c ), `I^(-)` gets oxidised to `I_(2)`. In (d), `KIO_(4)` gets reduced from `I^(7+)` to `I^(5+)`.

Discussion

385.	Which of the following combination will produce `H_(2)` gas ?A. Cu metal and conc. `HNO_(3)`B. Zn metal and NaOH (aq)C. Au metal and NaCN (aq) in the presence of airD. Fe metal and conc. `HNO_(3)`
Answer» Correct Answer - B Nitric being a strong oxidising agent, oxidises initially Cu to `CuO` which further reacts with `HNO_(3)` to form `Cu(NO_(3))_(2)` with the evolution of `NO_(2)` gas. However , `H_(2)` gas is not produced. Fe becomes passive in conc. `HNO_(3)` due to the formation of an impervious layer of iron oxide on its surface which prevents the further action. Au reacts with NaCN in presence of air to form soluble complex of dicyanoaurate (I) `underset("Dicyanoaurate "(I))(4Au + 8 NaCN+ 2H_(2)O + O_(2) to 4Na [Au(CN)_(2)]+4NaOH`) Only Zn reacts withe NaOH solution to evolve `H_(2)` gas `Zn+2NaOH overset(Delta)to underset("Sod. zincate")(Na_(2)ZnO_(2))+H_(2)`

Discussion

386.	The oxide that gives `H_(2)O_(2)` on treatment with dilute `H_(2)SO_(4)` is …………….A. `PbO_(2)`B. `BaO_(2).8H_(2)O`C. `MnO_(2)`D. `TiO_(2)`
Answer» Correct Answer - B Oxides such as `BrO_(2), Na_(2)O_(2)`, etc. which contain peroxide linkage (i.e., `""_(-)O-O^(-)` or `O_(2)^(2-)`) on treatment with dil. `H_(2)SO_(4)` give `H_(2)O_(2)` but dioxides (O=M=O, where M is the metal atom) such as `PbO_(2), MnO_(2), TiO_(2)` do not give `H_(2)O_(2)` on treatment with dil. `H_(2)SO_(4)` .

Discussion

387.	The oxide that give `H_(2)O_(2)` on treatment with dilute `H_(2)SO_(4)` isA. `PbO_(2)`B. `BaO_(2).8H_(2)O`C. `MnO_(2)`D. `TiO_(2)`
Answer» Correct Answer - B `BaO_(2).8H_(2)O_((s))+H_(2)SO_(4(aq))to BaSO_(4(s))+H_(2)O_(2(aq))+8H_(2)O_((l))`

Discussion

388.	When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged withA. `H^(+)`ionB. `Ca^(++)` ionsC. `SO_(4)^(=)` ionsD. `Mg^(++)` ions
Answer» Correct Answer - B,D `Na_(2)Al_(2)Si_(2)O_(8).xH_(2)O" "("zerolite") + Ca^(2+) to CaAl_(2) Si_(2)O_(8).xH_(2)O+ 2Na^(+)` or , or `Mg^(2+) , MgAl_(2)Si_(2)O_(8).xH_(2)O`

Discussion

389.	What is true about ice ?A. Its density is more than waterB. It is a good conductor of heatC. It is a thermal insulatorD. Its density is less than water
Answer» Correct Answer - C,D Density of ice is lesser than water so it floats on the surface of water.

Discussion

390.	(i) Draw the gas phase and solid phase structrue of `H_(2)O_(2)` (ii) `H_(2)O_(2)` is a better oxidising agent than water. Explain.
Answer» (ii) `H_(2)O_(2)` is a better oxidising agent than water as discussed below: (a) `H_(2)O_(2)` oxidises an acidified solution of KI to give `I_(2)` which gives blue colour with starch solution but `H_(2)O` does not (b) `H_(2)O_(2)` turns black PbS to white `PbSO_(4)` but `H_(2)O` does not

Discussion

391.	What do you except the nature of hydrides if formed by the elements of atomic number of 15,9,23,44 with dihydrogen?
Answer» (i) The element with atomic number (Z)=15 is P and the corresponding hydride is phosphine `[PH_(3)]`. It is covalent in nature. (ii) The elements with atomic number (Z)=19 is K and the corresponding hydride is potassium hybride `(K^(+)H^(-))`. It is ionic in nature. (iii) The element with atomic number (Z)=23 is V(vanadium). It is a transition metal. It forms as interstitial hydride `(VH_(1.6)`. The element with atomic number (Z)= 44 is Rh (Rhuthenium). It is also a transitioin metal but does not not form any hydride due to hydride gap (as it is present in group 8). Out of the hydrides listed, only the ionic hydrides react with water to evolve hydrogen gas. `2K^(+)H^(-)(s)+2H_(2)O(l) to 2KOH(aq)+H_(2)(g)`

Discussion

392.	Which of the halogen has maximum affinity for hydrogen ?A. `F_(2)`B. `Cl_(2)`C. `Br_(2)`D. `I_(2)`.
Answer» Correct Answer - A `F_(2)` has maximum tendency to react with hydrogen. The decreasing order of reactivity is `F_(2)gtCl_(2)gtBr_(2)gtI_(2)`.

Discussion

393.	Which of the following statement(s) is/are correct in the case of heavy water ?A. Heavy water is used as a moderator in nuclear reactor.B. Heavy water is more effective as solvent than ordinary water.C. Heavy water is more associated than ordinary water.D. Heavy water
Answer» (a,c )Both the statements are correct

Discussion

394.	Which of the following statement(s) is/are correct in the case of heavy water ?A. Heavy water is used as a moderator in nucler reactorB. Heavy water is more effective as solvent than ordinary waterC. Heavy water is more associated than ordinary waterD. Heavy water has lower boiling point than oridnary water
Answer» Correct Answer - A::C Heavy water is used as moderator in nucler reaction. Bolling point of heavy water is high than ordinary water and it is not as effective in the form of solvent as water due to its low dielectric constant.

Discussion

395.	Which of the following statements about hydrogen are correct ?A. Hydrogen has three isotopes of which protium is the most common.B. Hydrogen never acts as cation in ionic salts.C. Hydrogen ions, `H^(+)` , exists freely in ionic solutionsD. Dihydrogen does not act as a reducing agent.
Answer» Correct Answer - A::B Hydrogen has three isotopes . However, `H^(+)` being small never exists as cation in ionic compounds.

Discussion

396.	Which is the lightest gas ?A. NitrogenB. HeliumC. OxygenD. Hydrogen.
Answer» Correct Answer - D Hydrogen is the lightest gas.

Discussion

397.	Zeolite used to soften hardness of water is hydrated:A. Potassium aluminium borateB. Sodium aluminium silicateC. Calcium aluminium silicateD. Zinc aluminium silicate.
Answer» (b) is the corect answer

Discussion

398.	Hardness of water is due to the pair if ions:A. `Ca^(2+) and K^(+)`B. `Mg^(2+) and K^(+)`C. `Ca^(2+) and Mg^(2+)`D. `Ba^(2+) and Zn^(2+)`
Answer» (c ) `Ca^(2+) and Mg^(2+)` ions cause the hardness of water

Discussion

399.	The reagent(s) used for softening the temporary hardnes of water is(are):A. `Ca_(3)(PO_(4))_(2)`B. `Ca(OH)_(2)`C. `Na_(2)CO_(3)`D. `Na_(2)CO_(3)`.
Answer» (b,c) Both `Ca(OH)_(2) and Na_(2)CO_(3)` can remove temporary hardness from water.

Discussion

400.	If an isotope of huydrogen has two neutrons on its atom, the atomic number and mass number will respectively will be:A. 2 and 1B. 3 and 1C. 1 and 1D. 1 and 3
Answer» (d) Atomic number =no. of p=1 Mass number=no. of p+no. of n=3

Discussion

Explore topic-wise InterviewSolutions in .

The colour of hydrogen isA. BlackB. YellowC. OrangeD. Colourless.

Which of the following is an atom of tritium?A. B. C. D.

Which of the following statements is correct?A. Metallic hydrides are deficient of hydrogenB. Metallic hydrides conduct heat and electricityC. Ioniuc hyrdrieds do not conduct electricity in solid stateD. ionic hydrides are very good conductors of electricity is solid state.

Which of the following statements is correct?A. Hydrides of group 13 act as Lewis acidsB. Hydrides of group 14 are electronC. Hydrides of group 14 act as lewis acidsD. Hydrides of group 15 act as Lewis bases

Metal which does not react with cold water but evolves `H_(2)` with steam is `:`A. NaB. MgC. AuD. Fe

Which of the following is a true structure of `H_(2)O_(2)` ?A. B. C. D.

`H_(2)O_(2)rarr 2H^(+)+O_(2)+2e^(-),E^(@)=-0.68V`. This equation represents which of the following behaviour of `H_(2)O_(2)`A. ReducingB. OxidisingC. AcidicD. Catalytic.

`H_(2)O_(2)` is always stored in black bottles becauseA. It is highly unstableB. Its enthalpy of decomposition is highC. It undergoes autooxidation on prolonged standing.D. None of these.

`H_(2)O_(20` is always stored in black bottles becauseA. It is highly unstableB. Its enthalpy of decomposition is highC. It undergo autoxidation on prolonged standingD. None of these

Which of the following is wrong about `H_(2)O_(2)` ? It is usedA. As aerating agent in production of sponge rubberB. As an antichlorC. For restoring white colour of blackened lead paintingD. None of the above.

When a mixture of ammonium sulphate and `50% H_(2)SO_(4)` is electrolysed, the products formed at anode and cathode areA. `H_(2)` and `H_(2)O_(2)`B. `(NH_(4))_(2)S_(2)O_(8)` and `H_(2)`C. `H_(2)` and `NaHSO_(4)`D. `H_(2)O_(2)` and `H_(2)`.

When 50% solution of `H_(2)SO_(4)` is electrolysed by passing a current of high density at low temperature the main products of electrolysis are:A. oxygen and hydrogenB. `H_(2)` and peroxy disulphuric acidC. `H_(2)` and `SO_(2)`D. `O_(2)` and peroxy disulphuric acid

Which of the following statements is incorrect ?A. `H_(2)O_(2)` can act as an oxidising agentB. `H_(2)O_(2)` can act as a reducing agentC. `H_(2)O_(2)` has acidic propertiesD. `H_(2)O_(2)` has basic properties.

`H_(2)O_(2)` isA. poor polar solvent than waterB. better polar solvent than `H_(2)O`C. both have equal polarityD. better polar solvent but its strong auto oxidising ability limits its use as such.

Name the phenomenon as a reason of which water has unusual boiling point.

Density of ice is ………than density of liquid water.

Mention the temperature at which density of ice is maximum.

At atmospheric pressure, ice crystallized in the ………form but at very low temperature, it condenses to……. form.

In which of the compounds does hydrogen have an oxidation state of -1 ?A. `CH_(4)`B. `NH_(3)`C. `HCl`D. `CaH_(2)`

The low density of ice compared to water is due toA. Intense covalent bondingB. Dipole-induced dipole interactionC. Intense hydrogen bondingD. Dipole-dipole interactions

`H_(2)O_(2)` isA. Poor polar solvent than waterB. Better polar solvent than `H_(2)O`C. Both have equal polarityD. Better polar solvent but its strong auto oxidising ability limits its use as such

Hardness of water cannot be removed byA. Treating with washing sodaB. BoilingC. Adding calgonD. Addition of chlorine.

`H_(2)O_(2)` is stored inA. Glass containersB. Metallic vesselsC. Plastic vesselsD. Conttainers exposed to sunlight.

Temparary hardness may be removed from water adding.A. `CaCO_(3)`B. `Ca(OH)_(2)`C. `CaSO_(4)`D. `HCl`

The name hydrogen was given by1. Cavendish2. Lavoisier3. Haber4. none of these

Hydrogen perxoide acts as oxidising agent?A. netural mediumB. alkaline mediumC. alkaline and neutral mediumD. acidic and alkaline medium.

Which is the lightest of all elements?1. hydrogen2. helium3. lithium4. none of these

The process of adding oxygen to a substance is called1. oxidation.2. reduction.3. displacement.4. hydrogenation.

Hydrogen burns in air with aA. light bluish flameB. yellow flameC. cimson red flameD. green flame.

The oxide that gives `H_(2)O_(2)` on treatment with a dilute acid isA. `PbO_(2)`B. `Na_(2)O_(2)`C. `MnO_(2)`D. `TiO_(2)`

The oxide that gives `H_(2)O_(2)` on treatment with a dilute acid isA. `MnO_(2)`B. `PbO_(2)`C. `Na_(2)O_(2)`D. `TiO_(2)`

Which of the following equations depict theoxidising nature of `H_(2)O_(2)` ?A. `2MnO_(4)^(-)+6H^(+)+5H_(2)O_(2)rarr 2Mn^(2+)+8H_(2)O+5O_(2)`B. `2Fe^(3+)+2H^(+)+H_(2)O_(2)rarr 2Fe^(2+)+2H_(2)O+O_(2)`C. `2I^(-)+2H^(+)+H_(2)O_(2)rarr I_(2)+2H_(2)O`D. `KIO_(4)+H_(2)O_(2)rarr KIO_(3)+H_(2)O+O_(2)`

Which of the following combination will produce `H_(2)` gas ?A. Cu metal and conc. `HNO_(3)`B. Zn metal and NaOH (aq)C. Au metal and NaCN (aq) in the presence of airD. Fe metal and conc. `HNO_(3)`

The oxide that gives `H_(2)O_(2)` on treatment with dilute `H_(2)SO_(4)` is …………….A. `PbO_(2)`B. `BaO_(2).8H_(2)O`C. `MnO_(2)`D. `TiO_(2)`

The oxide that give `H_(2)O_(2)` on treatment with dilute `H_(2)SO_(4)` isA. `PbO_(2)`B. `BaO_(2).8H_(2)O`C. `MnO_(2)`D. `TiO_(2)`

When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged withA. `H^(+)`ionB. `Ca^(++)` ionsC. `SO_(4)^(=)` ionsD. `Mg^(++)` ions

What is true about ice ?A. Its density is more than waterB. It is a good conductor of heatC. It is a thermal insulatorD. Its density is less than water

(i) Draw the gas phase and solid phase structrue of `H_(2)O_(2)` (ii) `H_(2)O_(2)` is a better oxidising agent than water. Explain.

What do you except the nature of hydrides if formed by the elements of atomic number of 15,9,23,44 with dihydrogen?

Which of the halogen has maximum affinity for hydrogen ?A. `F_(2)`B. `Cl_(2)`C. `Br_(2)`D. `I_(2)`.

Which of the following statement(s) is/are correct in the case of heavy water ?A. Heavy water is used as a moderator in nuclear reactor.B. Heavy water is more effective as solvent than ordinary water.C. Heavy water is more associated than ordinary water.D. Heavy water

Which of the following statements about hydrogen are correct ?A. Hydrogen has three isotopes of which protium is the most common.B. Hydrogen never acts as cation in ionic salts.C. Hydrogen ions, `H^(+)` , exists freely in ionic solutionsD. Dihydrogen does not act as a reducing agent.

Which is the lightest gas ?A. NitrogenB. HeliumC. OxygenD. Hydrogen.

Zeolite used to soften hardness of water is hydrated:A. Potassium aluminium borateB. Sodium aluminium silicateC. Calcium aluminium silicateD. Zinc aluminium silicate.

Hardness of water is due to the pair if ions:A. `Ca^(2+) and K^(+)`B. `Mg^(2+) and K^(+)`C. `Ca^(2+) and Mg^(2+)`D. `Ba^(2+) and Zn^(2+)`

The reagent(s) used for softening the temporary hardnes of water is(are):A. `Ca_(3)(PO_(4))_(2)`B. `Ca(OH)_(2)`C. `Na_(2)CO_(3)`D. `Na_(2)CO_(3)`.

If an isotope of huydrogen has two neutrons on its atom, the atomic number and mass number will respectively will be:A. 2 and 1B. 3 and 1C. 1 and 1D. 1 and 3